PC turns on, then shuts off, and tries to restart, fails

greengrassgamer · Sep 4, 2015

So I recently finished building my gaming computer. I was really excited, and at one point, I decided to set Steam to download a game overnight. When I woke up, my computer was in sleep mode. When I woke it up, the game was downloaded. But I forgot to turn the computer off when I left for school at 7:00. When I got back home at about 6 PM, I saw my computer was in sleep mode again, and I woke it up and got an image on the screen from where it left off that morning. I turned it off to put in some new RAM. When I booted it up again, it went to the normal screen that pops up when you turn a computer on. In this case, it was the ASUS logo. When the screen disappeared, the monitor flashed for a second, and the computer shut off bu itself. Then it suddenly turned on again. The screen came up, it went away, and then the monitor flashed, and the computer shut off. Then it started up by itself again. This went on for a while until I checked all the connections and read some forums about the problem. They suggested taking out the CMOS battery and putting it back in, and then it would work. I tried that. It made no difference. Another forum said that the HDD may be acting up, so I unplugged it, and plugged it back in again. Nothing. The forum also said that you should try using a different hard drive. So I took a hard drive from an old Windows XP computer. It started up normally, but about 3 seconds after first showing the Windows XP logo with the blue loading bar, the computer shut off, then restarted by itself. So I'm pretty sure the problem is NOT with the HDD. All I can think of that I did wrong was that I left my computer on for a long time. I need help, please. I would really appreciate it.

Motherboard: ASUS A58M-E

UPDATE: I have been researching some more, and now I suspect the power source may be the problem. How can I test this?

alexoiu · Sep 4, 2015

Try leaving single RAM stick installed. Test each slot.

greengrassgamer · Sep 10, 2015

alexoiu :

It didn't work. Used one 2GB stick in the first slot, didn't work. The same happened with the other slot. ):

alexoiu · Sep 10, 2015

If leaving only CPU and CPU fan installed and starting the board, still same restarts?

greengrassgamer · Sep 21, 2015

alexoiu :

Yep. I am also suspecting that my PSU is the problem.

alexoiu · Sep 25, 2015

Now try disconnecting the 4 pin power cable, connecting a case fan to the board and starting it. See if the fan does spin without restarting.

greengrassgamer · Oct 1, 2015

alexoiu :

I don't have a case fan, unfortunately. Could I use my CPU fan as an alternative? Or do I have to go get one?

alexoiu · Oct 1, 2015

You can use the CPU one, but connect it to a CHA_FAN header. Disconnect the 8 pin power cable and start the board.

greengrassgamer · Oct 26, 2015

So here's the story since October 1st: I fiddled around with my PC for a while and tried different suggestions I found online. None of them worked. Then I told one of my teachers, who is a computer expert, about my problem. He told me the problem may be with my operating system, and he let me borrow a Windows boot disk. I booted it up, and selected "Repair Your Computer". And that fixed it all! My PC has been running great ever since.

So, if you have this problem, check your operating system. That may be the solution!

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